refactor(DefaultContainer): SidebarToggler add defaultOpen prop example

Author: xidedix

src/containers/DefaultContainer.vue

@@ -6,7 +6,7 @@
         <img class="navbar-brand-full" src="img/brand/logo.svg" width="89" height="25" alt="CoreUI Logo">
         <img class="navbar-brand-minimized" src="img/brand/sygnet.svg" width="30" height="30" alt="CoreUI Logo">
       </b-link>
-      <SidebarToggler class="d-md-down-none" display="lg" />
+      <SidebarToggler class="d-md-down-none" display="lg" :defaultOpen=true />
       <b-navbar-nav class="d-md-down-none">
         <b-nav-item class="px-3" to="/dashboard">Dashboard</b-nav-item>
         <b-nav-item class="px-3" to="/users" exact>Users</b-nav-item>